🔧 Brass Transmission Line Fitting: Derale 13031 5/16" Cooler Line to 3/8" NPT Hose Barb - Universal Review

This is perfect for my factory transmission cooler lines for my 2005 Chrysler Town & Country. I highly recommend buying a shim maker to seal the threads as the transmission fluid was seeping through the threads until I used the shim maker. It would be nice if it came with an o-ring or gasket to seal the threads.

If you buy these don't use teflon tape. Use oil resistant RTV caulk, caulk, or silicone on the 3/8 threads. If you use something else they will leak a lot. My first kit came with a Derale transmission cooler. We used Teflon on two separate trucks and they were leaking at 3/8th threaded ports. I noticed that the 5/16 compression fitting is also leaking a bit. I've thought about fixing the fitting in case it comes loose while driving on the road, but haven't used it yet. Overall, the product is a

This is a good quality solid brass fitting, assembled as intended. I bought mine to connect my existing 5/16" steel transmission coolant lines to a 3/8" flex hose when installing a new offline transmission cooler ahead of the radiator/condenser. This isn't a common size combination, so it was helpful to find everything together here. If you have a well-stocked hardware store near you, you can assemble all 4 matching parts for this kit separately to save a lot of money. TIP 1: Use pipe sealant…